Apparatus for filtering and for forming articles from pulp solutions



May 12, 1925. 1,537,195

O. J. SALISBURY APPARATUS FOR FILTERING AD FOR FORMING ARTICLES FROMPULP SOLUTIONS .4 TTOHNEYS May l2, 1925. y

. O. J. SALISBURY APPARATUS Fox FILTERING .uw Fon FoRMlNG ARTICLES FROMPULP soLUTIoNs Filed Sept. 13. 192l 4Sheets-Sheet 2 IN VEN 70H il ATTCHA'E YS May 12, 192.5. 1,537,195

O. J. SALISBURY APPARATUS FOR FILTERING AND FOR FORMING ARTICLES FROMPULP SOLUTIONS Fi1edSept-15. 1921 l 4 sheets-sheet s May 12, 1925. n1,537,195

o. J. sALlsBURY `APPARATUS FOR FILTERING AND FOR FORMING ARTICLES FROMPULP SOLUTIONS Filed Sept. 15. 1921 sheetsn-shevet 4 y Arrow/frsFiltering and for Forming, Articles Patented May .12, 1925,

, UNITED STATES PATENT oFFicE.

ORANGE J. SALISBURY, 01E' SALT CITY, UTAH.

APPARATUS EOR. FILTERING AND FOR FORMING ARTICLES FROM Application l'edSeptember 13, 1921. Serial No. 500,300.

To all whom it may cof/wem:

Be it known that I, ORANGE J. SALISBURY, a citizen of the United States,residing in Salt Lake City, county of Salt Lake, and

State of Utah, have invented certain new and. usefullmprovements inApparatus for from Pulp Solutions, of which the following is aspecification.

elevation, partly `When used for filtering, the invention isparticularly useful in connection with the filtration of metallurgicalslimes, ores, concentrates and residues, the filtration of products andwaste materials encountered in the manufacture of sugar and itsproducts, and the filtration of chemical precipitates, compounds andclays.

When used for forming articles,l vention is particularly adapted for thepreparation of sheets and special forms made from fibrous pulps, such ashairy paper and wood pulps, and mixtures of fibrous, hairy and paperpnlps with fillers and binders of various kinds, depending upon thearticle which is to be produced.

The invention will be understood from the following description fcertain embodiments thereof which are shown in the accompanyingdrawings, in which, Figure l is a side elevation partly in section of a1na- Lchine for formino' a sheet of material having indentationstherein; Figure 2 is an end in section, of the machine shown in Figure1; Figure 3 is a fragmentary sectional elevation of a portion of themachine shown in Figures l and 2, illustratingparticularly theconstruction whereby air suction and pressure are applied to `the filterdrum; Figure l is a fragmentary sectional elevation on the line 4--4 ofFigure 2,

. illustrating particularly the hub of the lter ure 6 is a fragmentarydrum; Figure 5 is a elevation on the line 5-5 of Figure 4:; Figsectionalelevation showing the manner inwliieh the deposited material leavesthedrum of the machine shown in Figuresl and 2; Figure 7 is a sideelevation, partly in` section, of a modified' form of the invention;Figure 8 is a plan ,view of the web used in the machine shown in Figure7 Figure 9 is a fragmentary plan view of a portion of the outside of thedrum shown in Figures 1 and 2; Figure 10. is a side elevation of aportion of the sheet formed on the machine shown in Figures 1 and 2.

the inin the hollow shaft 5.

fragmentary sectional The formof the invention embodied in the machineshown in Figures 1 to 5 will first be described. In thismachine, tank 1,adapted to contain a pulp solution, is shown supported upon a frame 2mounted on legs 3. Movable within tank 1 is a vacuum filter elementinthe form of a rotatable drum. As sho-wn, this drum has a hollow shaft5, mounted in bearings 6 and 7 supportedon the tank frame. Rigidlysecured to the shaft 5 lare the drum heads 9. Between these drum headsand secured thereto is a cylindrical casing 10; and secured to theoutside of this casing and extending.longitudinally thereof are ribs 11the outer edges of which lie in the cylindrical plane of the outer edgesof the drum heads 9. The longitudinal troughs thus formed between theribs 11 on the outside of the' casing 10 are connected withthe inside ofthe hollow shaft 5 by a plurality of pipes 12, the ends of which are setin holes in the casing 10 and in holes Secured to the outer edges of thedrum heads 9 and ribs 11 is a filter surface 13 which may be of wiremesh or filter fabric. In the machine of Figures 1 and 2, this filtersurface 13 is shaped in conformity with the article to be made by beingprovided with semi-spherical indentations 14, as shown in Figures 1, 2and 9. The filter drum is, slowly rotated through aworm gear 15 securedto a sleeve 5?* keyed to one end of the shaft 5, with whichgear meshes aworm 16 mounted on a shaft 17 journaled in bearings mounted on the legs3, the end of shaft 17 being provided with fast. and loose pulleys 18Vand 19 belted to a suitable source of power. Within the hollow shaft 5,are certain suction and air-blast passages which are provided in amanner which will be'clear from Figures 3, ltand 5. As shown in thesegures, there is arranged within the hollow shaft 5 a partitioning memberhaving a cylindrical portion 2() from which extend radial fins 21, 22and 23. The partitioning member at one end isprovided with a hub portion25 which closes the adjacent end of the hollowshaft 5; and at its otherend the partitioning member is 'provided with a hub 26 which extendsinto 22 and 23 are in slipping engagement with PULP SOLUTIONS.

the inside surface of the hollow shaft 5. There is thus provided an airblast passage 27 to which is connected a pipe 28; a suction passage 29to which is connected a pipe 30; and another' suction passage 31 towhich is connected a pipe 32. The pipes 28, 30 and 82 are connected totheir respective passages through the hub 26 of the partitioning memher,and these pipe-s may serve to prevent such member from rotating. Thepipe 28 is connected to a source of air under pressure; the pipe 30 isconnected to a source of strong suction; and the pipe 32 is connected toa source of medium suction for purposes hereinafter explained indescribing the operation of the machine.

Separable from the filter drum and arranged to move through the tank 1and in contact with said filter drum, is a web 41 of some suitablefabric. During its passage within the tank 1 the web '41 is supported bythe filter drum; and during its passage outside of the tank 1 the webruns lover idler rollers 42, 43, 44, 45 and 46 and between drawingrollers 47 and 48. The-idler rollers 43, 44, 45 and 46 serve to carrythe web 41 through a cleaning chamber 50. One side of the belt iscleaned by a brush 51 driven in vthe direction of thearrow, the cleaningoperation being assisted by jets of Water from a row of nozzles 52directed at the web 41 at about the point where it is engaged by thebrush 51. The other side of the belt is cleaned in a similar manner by.a brush 53 rotating in the direction of the arrow, with which cooperatesa row of nozzles 54 directing water against the web. The cleaning`chamber 50 is shown as provided with reservoirs 56 and 57 in which thecleaning water is collected, these reservoirs being drained in any`suitable manner. The web 41, from a point near the top, of the filterdrum to a point near the roller 42, may be supported by a shelf 60.kBelow the roller 42 is a roller 61 carrying a conveyor belt 62 which isdriven in the direction of the arrow at approximately the same speed asthe -speed of the web 41.v The upper part of the filter drum is enclosedby a casing 65 which extends to the point 66, and in its upper part isprovided with heating means such as transversely extending coils 67 ofsteam heated pipe.

The mode of operation of the machine shown in Figures 1 to 6 is asfollows: A suitable pulp solution is supplied to the tank l1, and themachine is` put in operation.

During the revolution of the filter drum, the web 41, soon after itleaves the drawing rollers 47 and 48, is sucked into snug engagementwith the periphery of the filter drum by the strong suction applied tothe periphery of the drum during that portion of its travel ashereinbefore explained. While the web covered surface of the filterdetail.

drum is submerged in the pulp solution, pulp from the latter is causedto be deposited upon the web 41 by the action of the medium suctionapplied, as hereinbefore described. During the depositing of the pulp,the filtered solution is carried away through the suction pipe V32 and,even after the deposited material leaves the solution, the suction whichis continuously applied to it continues to remove moisture. This removalof 4moisture from the deposited material, after 65, it continues to becarried along upon the web 41 until it reaches roller 42. At this point,the deposited sheet leaves the web 41 and ,is carried away by theconveyor belt 62. After the web 41 is cleared of the deposited sheet, itis cleaned by the brushes 51 and 53 in the manner hereinbeforedescribed, and again passes into the tank 1 and around the filter drum.

The invention, as embodied in the machine shown in Figure 7, will not bedescribed in This machine is intended either `merely for filtering orfor the production of flat sheets, The tank casing, the drum drivingmechanism and the means for supplying suction and an air blast to theperiphery of the filter drum, are the same in this machine as in themachine shown in Figures l to G, and are correspondingly numbered. Thesurface of the filter drum, however, `instead of being provided withsemi-spherical indentations, is a plane surface 13a with the result thatthe material deposited thereon and on the web 41a is thus caused to bemercly a flat sheet. The machine of Figure 7 also differs from themachine of Figures l to 6 in that no means are provided for cleaning theweb 41a. As shown, the web is supplied from a roll 70 mounted intrunnion 711 an idler roller 72 being provided for guiding the web intothe tank. After passing through the tank in engagement with the drum,and over the idler rollers 74 and 75, the web is wound up in to a rollon an arbor 76 mounted in trunnions 77 and driven at proper speed from`a source of power through a gear 78 and pinion 79. For rcceiving thedeposited material from the web 41a, there may be provided a conveyorbelt 80, having approximately the same speed as the speed of the web,said belt being carried by a roller 81 which may be journaled in machineshown in Figures `1 to 6. The pulp solutionor the solution to befiltered is supplied to the tank 1 and the machine is put in operation.As in the machine previously described, the material deposited upon theweb 41a is partially dried by the heat of the coils 67 and the suctionwhich` continues to be applied to the material after it leaves thesolution; and at the top of the drum the material is loosened from theweb 41EL by the action of the airblast. The deposited material in theform of a fiat sheet leaves the web 41n Where the latter passes over theroller 74, and is carried away by the conf veyor belt 80. During isunwound from the.

the operation of the machine, the web 41a roll 70 and is wound up on thearbor 76. When the web has been transferred from the roll 70 to thearbor 76, another roll of web may be substituted and the used roll maybe removed and cleaned in any suitable manner.

While I have shown certain forms in which m invention may be' embodied,itis to be un erstood that these are merely illustrative and that theinvention may be embodied in many Iother styles of machine adapted forfiltration or for forming articles of various kinds.

What I claim is: A

1. In a machine of the character described, a tank adapted to contain apulp solution, a vacuum filter drum rotatable in said tank,

mold elements on said drum, a web separable from said drum and arrangedto move through said tank in contact with the mold elements, means forsupporting said web outside of said tank so that said web will act as aconveyor of the material deposited upon said belt, and means for dry'ingthe material while it is being conveyed away from the filter drum.

2. In apparatus for forming articles from pulp solutions a strongsuction means for seating a filtering surface and a suction means oflesser strength. for the precipitation of pulp from said solution uponthe surface aforesaid.

3. In apparatus for forming articles .from

pulp solutions a filter web, means for ,exertin a strong suction throughsaid web to brmg it to position and a second modified suction meansexerted after the said web is positioned, for the purpose of causingpulp precipitation thereon. i f

4. Means fortlie continuous production of articles from pulp solutionprecipitates, comprising a mould drum, a pulp tank, a web, and acleaning means, said mould drum partially submerged in the solution insaid ulp tank, said web partially encircling said rum and interposedbetween the moulds thereon and the aforesaid solution in the tank butseparable. from said drum, said cleaning means adapted to engage saidweb when separated from said drum to clean the same.

5. Means for the continuous production of articles from pulp, comprisinga suction drum, an' article shaping surface on the drum, a pulp tank,and a web, interposed between the article shaping surface and the pulpin the tank, and means tb rotate the drum and web inthe tank.

In testimony whereof I have affixed my signature to this specification.v

' ORANGE J. SALISBURY.

